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XD
6 tháng 3 2019
1. He has never gone abroad before.
2. She has driven for 1 month
3. We have eaten since it started to rain
4. I haven't had my hair cut when I left her
5. She hasn't kissed me for 5 months.
6. We haven't met for a long time.
7. How long have you had it?
8. I haven't had a delicious meal before
9. The last time I saw him was 8 days ago.
10. It is my first time I have ever taken bath since Monday
6 tháng 3 2019
1. He hasn’t gone abroad before.
2. She has driven for a month.
3. We have already eaten when it rained.
4. I haven’t cut my hair since I left her.
5. She hasn’t kissed me for 5 months.
6. We haven’t met for a long time.
7. How long have you had it?
8. I haven’t had such a delicious meal before.
9. The last time I saw him was 8 days ago.
10. It is Monday since I last took a bath.
DT
14 tháng 2 2022
1.
a,\(BaCl_2+H_2SO_4\rightarrow BaSO_4\downarrow+2HCl\)
b, \(3Cu+8HNO_3\rightarrow3Cu\left(NO_3\right)_2+2NO\uparrow+H_2O\)
c, \(2NaOH+Ca\left(HSO_3\right)_2\rightarrow CaSO_3\downarrow+Na_2SO_3+2H_2O\)
12 tháng 12 2018
\(13\left(x+45\right)=13^{29}:13^{27}\)
\(\Leftrightarrow13\left(x+45\right)=13^{29-27}\)
\(\Leftrightarrow13\left(x+45\right)=13^2\)
\(\Leftrightarrow x+45=13\)
\(\Leftrightarrow x=-32\)
19 tháng 2 2023
\(C_4H_{10}\rightarrow C_2H_4\rightarrow C_2H_5OH\)
PT: \(C_4H_{10}\underrightarrow{cracking}C_2H_4+C_2H_6\)
\(C_2H_4+H_2O\rightarrow C_2H_5OH\)
GH
21 tháng 8 2023
Bài 8:
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,1--->0,15------>0,05---------->0,15
a. \(V_{H_2SO_4}=\dfrac{0,15}{1}=0,15\left(l\right)=150\left(ml\right)\)
b. \(V'=0,15.22,4=3,36\left(l\right)\)
c. \(CM_{Al_2\left(SO_4\right)_3}=\dfrac{0,05}{0,15}=\dfrac{1}{3}M\)
KV
29 tháng 10 2023
Ở hình 2, kho sao chép nội dung từ ô E4 sang ô E5 thì nội dung ở ô E5 là: =$C$4*$D$4 vì ta đã cố định địa chỉ trong công thức
TA
3
Vì có nhiệt độ nóng chảy là 80oC